<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>Document</title>
    <style>
        p::before{
            content: "啊啊啊";
        }
        p::after{
             content: "哈哈哈";
        }
    </style>
</head>
<body>
    <p>嘎嘎嘎</p>
</body>
</html>